Switching apparatus.



Patented Bed-18,1917

' SVSHEETS-SIHEETIY W. M. SCOTT.

SWIICHING APPARATUS.

APPLICATION FILED NOV-4.1914. 1,250,674.

W. M. SCOTT;

' swrfcmm; APPARATUS. Al rucmou FILED NOV. 4. 1914. 1,250,674. Patented Dec. 18,1917.

5 SHEETS-SHEET 2.

Patented Dec. 18,1917.

5 SHEETS-*SHEET 3.-

. H. Q 7 u 4 M 1 1 .G 1 7 f V 0 .L L 1 2 5 WHI U 5 90 3 m 3 c L 3 L I I 1 G B M Q x. I ll .r L G w m .r G .G A 7 w. M. soon.

SWITCHINGAPPAHATUS.

APPLICATION FILED NOV. 4. I914.

1,250,674. b Patented Dec. 18,191?

5 SHEETS-SHEET},

illllllllllllll mmw 0 43 V lm mvtoz ft h I, m A 1 w i' g umthe 11 perand' lower 7 he 0d 72 to ing a yielding 1 5 One: term by 'conduc n Whe l mount of 1 v b am "9 n Mdvable see F1gm1 to e fs tel-namely. Qsed that 1th and '1' such that 'the upper #111 11 3,.tobe attracted upwardly and transmit The operators tripping switch 0, whose one terminalis connected to the supply conductor 137, which, with conductor 138, form A a supply circuit' (such as a direct current supply circuit, which may be connected with the conductors 135 and 136, or to some other suitable direct current source) is thrown over into engagement 0 with contact .139

whereupon current will flow from conductor 137 ,through the switch 0, conductor 140 to contact 141 through the connecting brid e 142. to contact 143, conductor 144 throug the trip coil Winding 37, and conductor'l45 to the conductor 138,energizing the trip coil 37 and causing its armature'36, Figs. 1 and through rod 34 'a' clockwise movement to the latch actuators of the lower breakers which thereupon dislodge the dogs 20 from the "rollers 21, allowing the toggle mechanism of the lower breakers-to collapse, as-il sisted by their springs 23', and tocause the;

bridging contacts 3 of the lower breakers to, separatefrom their fixed contacts 1 and 2,}1 thereby disconnecting the rotary converter,

from the transformer secondaries. VVhilei thelower. breakers were closed, the upper,

breakers were open,-as illustrated in Fig. 6), and accordinglythe upward movement 011;5 the rod 26, occasioned by the energizationi? of the trip coil. 37, produced no effect in thelfi [upper breakers; This tripping operation; having been accomplished, the switch 0 is} returned to'open position shown. When the) lower breakers are thus tripped and moved to their 'open circuit positions, the upper breakers being open, the roller 78 has pressed downwardly upon lever 75 and therefore ,putthe spring 77-between theupv pen'and lower parts ofrod/72- under' compression, and accordinglythe block 54 is thrustinto the blocking position against lug 53 as; indicated in Fig." 3, thusepositivel-yblocking the lower breakers'open, once hav ing been tripped and opened.

It will now be impossibleto close the lower breakers, which would result in throw-' ing full voltage of the secondaries of the transformers upon the armature A of the rotary converter which is now at rest. The locking block 54 canbe withdrawn only by an upward movement of the rod 72 and this canvoccuronly when the upper breakers are first closed, in which case the roller 78, will move inwardly toward the pivot of the cam arm 75 to remove the downward pressure previously exerted by the spring .77. But this, release of pressure of the spring 77 is not .suflicient to remove the block 54 from lug 53 and it must be moved upwardly 'by the rod- 58 controlled'by the armature member 60-, and this will not occur'except by later describedpredetermined electrical conditions obtaining.

To close the upper breakers, and thus throw less than the full voltage of'the transformer secondaries upon therotary converter to start it, the second operators switch O ,;connected.toconductor 137-, is thrown overqinto engagement with the contact 146 connectedby conductor 147 with theright hand contact 104 thence through-switch blade102andcontact 103 throu h theright hand solenoid winding 93 throng the switch v 106, 107 and thence through the series field F and armature A of the motor M .to the other conductor 1380f thesupply circuit.

This energizesthe solenoid 93 and, starts the I I motor M, which always rotates in the same direction, the solenoid 93 thereupon expanding the toggle which shifts thewor-m. 84,

driven by motor M, into mesh with the gear. 86,;r0tat1ng sald gear 111a clockwise direction, as viewed in Fig.5, thereby operating the crank 52 whichpulls downwardly upon the rod 50 attached to the arms 12 of the upperbreakers. These arms 12, I10W II1OV.-'.

ing in clockwise direction as viewed iniFig. 3, actuate the members 41 which engage the lower sides of the independent links 12 which are accordingly rotated in a clockwise direction about their pivots 11, thus actuating the toggle mechanism of the ,upper breakers to move; their bridging members 3.

into engagement with their contacts, ,1 and 2, and when this positionis' reached the dog latches-20 in the upper breakersengage their rollers .21 and thus lock the upper breakersin circuit closing position, whereupon the .low voltage is impressed by the transformer secondaries upon "the; rotary converter which is accordingly started. And

since during the starting period thejload uponthe rotary converter'is slight, the energy required to start it is relatively small,

"and accordingly the upper circuitbreakers need have current carrying capacity less than the lower circuit breakers which must transmit the alternating curent energy which isconverted into; the direct current energy constituting the loadupon the rotary converter.

As the motor Mis started, the switch :102 is shifted by the toggle controlled by sole-v noid 93 into engagement with contact 105, which localizes the motor circuit, thus robbing the switch O of control of the motor M, which, having once been started through.

switchv O continues to run because current is now supplied. independently of switch 0 through conductor 148.

'As the upper breakers reach closed posi- ,tion, the crank associated with the gear 86 has trippedthe right hand snap switch- 106 breaking the motor circuit at contact 107,- the motor then coming to rest, and the solenoid 93 deenergized with resultant collapsing of the toggle, restoring the switch 102: tothe position illustrated inFig. 6, and withdrawing the worm 84 from mesh with tor 'to' the'conductor 138; In consequence;

Lesa

motor switch 106,derail-1d through the mo:

- th left handsole'noi'd 93 actuates its toggle :which'aecordingly rotates the aims 12 ofthe,

and moves the worm 83' into meshwithgear wheel 8.5,the bealn 99 inthe' m antime ing' tilted to prevent engagementof worm Bl with gear 86, and the motor startingrotates the gear '85.- Immediately thejtforrh I has been s'hiftedQthe switch 102 {Metres com tact 104 and, engages contact 105, "thus" rob; bing'the operators switchO from further control of'the' circuit traced, and accord-1 ingly the motor continues to rotate and the crank 49 pullsdownwardly upon-the 47,

lower breakersm a clockwise di'reetion abouti ofthelowcr breakers and movingtheijr' mem-j here 3 into engagement with'their 'terminala blocks land 2." And the'lathes'QO "offtlie lower breakers engage their rollers 21and-loek a o 7 wardly upen the crank 38 attachedtothe? But as the rod e'f beginsto the;-

the breakers in'circ'u'it closing positi0n',"wh ere uponf' the transfomrers supply alternating 7 current energy at full voltage "through f the, lower-breakers to the-rotary converter whieh' delivers direct currentto thebuse's'livfiandx 136; 1 I

rod 44, actuated'with the rod uypulisfltwn A arms 12 0f the upper breakers: This ter-cloekwise m'oveInent ofthe erms12 in the" upper breakers,"-'as viewed in-Figs 1and 7 I "3,-causeethemembers41 to'engage the dog a latches 20 of. the upper breakers Lfllld disengage t'h'em from their rollers, thns'unlat'cliingf the upper breakerswhich willi acc'ordingly fly to open circuit position. But should the" toggle mechanism of "the upper breakers stickfor eny reason, themembersfltl will engage the'upper sides of the links 12 and; positively collapse the'upper toggles fur-1' ther insuring that the upper breakers shall be tripped-and positively opened" as the j lower breakers move toward circuit-closing V position, P This insures -1;hat*the uppe'rhreakr J ers' will be open beforefthe' lower bmaiiere are closed,fand prevents shortcircuiting'" of the transformer secondaries S f'Sf engl-f S above'reierredflto. t. i r

And when'the up er circuit breaker-ware thus opened, the fol er"'78' will depress the ea'ni lever 75, and accordingly compress the spring)? 7 inthe rod'72', preparatoryto again setting the locking blbckffil'in the lower breakers when they open; either in response 7 to energizationi of the trip coih B7 bf; fbr

any other eause' sothat the upper breakers must 1 againgfirst be closed heforef thei lower;

breakers can be" [When the lower breakersha ve ailed-5; circuitclojsing osition and there locked,"

v the upper I cireui breakers are all open; and

the circuit thro g elegtrotmagnt' 5 V transformer pa and chokecoil 156 is opened ateonfacts'lfi iand because the bridg'e3 v of the'jhreak'er B has separated the bridge ing 'eontact werfimmm, And the ciricult *ofthe trip coil 37* has" been closed as "indicated yat contacts 1413-142 and 143ml:

breaker B{ andthis-tri coil 37 canbe energized' hythrowing' the" operators lever-O 1 actuation of their latch actuators 24 by the armature 36. when the upper breekers' are clos'edthe circuit of t heitrip coil 37 may be closed by operators 7 switch Os engaging contact 139,;be'cause then thelbridging contact 159 "is in engagement with I contacts 160 and 161, the switch formed by these contacts being in parallel vwith the switch whose contacts are 141*a1id =143'at' the lower breaker B theseswitches' being closed at different times;- that is v only breakers 'are c osed.

With the apparatus described may into enge emeht contact 139 where-1 upoh the ower hreekers-will be tripped by associated suitablelight indicators or signals. These are indicated at R, RQ 'G'and G inea'ndeseent'lam'ps- 'RQ R being, for ex-* ample, red while lumps G G are for example 'nAll'theselamps have one ter- B B: has itsother terminal, connected 'tlirou gh feonduetoi" 162 with contact 163-" which is adapted tobe eonneeted with con taket-164"b 'thbridging contact --165 when the lower reakersi re open, the: contact communicating through conductor 145 with" thef'conductor =138m The glowing of thelamp" R thus "that the lower break-' 'miinal connected to theconductor "137. The

ers: aere-open;1itbeing understood thatthe switches and- '0} and the lamps maybe reinotefrcm' the motor M andthe apparatus actuated thereby. When f the lower breakers are closed, as indicated, the lamp G is glow ing beeease eel-mm is passi through it from' txmdlietdr 137; through conduetor' 165,

contacts ds and 1e? bridged by-contact 1- s,. contact; 151; cofnmiinicating with eonductor 5 138 through conductor 145513'111118, when the lower-breakers are closed, the green light G is' illuminated and when they'- are open the red light Risi illuminated and the green light G extinguished; Similarily,"when the upper breakers are open, the red lamp R" is illuminated by current from conductor 137 through conductor 169, contacts 170' and 1,71 bridged by the contact 172, eonducto'r'170 connecting through conductor 145 with con-K v duet6r' 138J'And'when the upper breakers are closed the 1 1 is xtmguished and? the green lamp passing therethrouglr ifrorn conductor 137 over conductor 173 connecting with contact 1 is lighted by current taict 175 with-contact 176 which communi- 85 when their" associated It will be understood that the herein described apparatus which differentiates be, tween fluctuating or alternating current of different frequencies or between fluctuating or alternating current and direct current may beutilized for purposes other than herein specified, as, for example, for controlling an, electric circuit, to open or close the same, which circuit may include any type of translating device, such ,as a lamp, signal, ,etc. And it will be understood'that the member 60 in addition to performing the controls herein describedfmay control a lamp or signal circuit to iiidicatethat. the armature A has attained a predetermined speed, .as synchronous speed. the member GOmay trip a latch or otherrestraining means of a circuit-vbreaker or switch, by movement ineitherdirection.

. While the apparatus herein described is such that two switches may not be simnl taneously closed, but both may be simultaneously open or either one closed, it vill be understood that my invention embraces also the reverse conditions, that is, Where. two switches maybe simultaneously,closed, either one closed, ,or both may not be simul ta neouslyopen. And it will accordingly, be understood for the sake ofbrevity th el claims-that the closed, position will bereferred to as thefnormal? position andftheopen position as z the .-,,fabnorm a1 ,,position, and that these terms include the reverse. conditions referred-to. ,l Certainieatures of my invention herei before-described are not herein claimed, but are described and claimed in my divisional. applications serially numbered-196,988 ,and 201,615, filed October 17 and Novemberlfl, 1917, respectively, pursuant ,to.a. requir,e.- ment for division. .v \Vhat I claim is: i U 1. The combination with 'a movable contact member of a switclmcf mechanism for actuating the same, an independently-mot able operating arm having pro'ections adapted tovengage and actuate sai .mech-,; anism in opposite directions, and [means for restrainingsaid contact member in nor;

anal position, one oiisaid projections actuat ins: said restraining means to freesaid con independently movable operating lever, means for restii'aining said contact member in normal position, a-projeetion on saidlever in its mm-ementin one direction actuating said restraining means and in opposite ,(ll', 10 rection a link of-said toggle; mechanism, and a second projection on said-leyer actuating said link when said first named projectionactuates said est-raining means.

4,? The combination with a morable Icontact-member of an electric switch, ot-ap otortfor actuatingthe same to normal position, means for rlockingsaid, contact member; in: normal position, means foractuating said locking, means to freesa-id, contact member, 1 30 a bloclgfor holdingsaid contactmember in, abnormal position, a switchgcontrollipg said motor, and electro-responsivemeansgtor aotus ating said block and-for controlling saidm0:-. tor-controlling switch. 1 35 5 .,'l he combination with a movable contaet member, of anclectric switch, of means for, rest-raining. ,the same in abnormal position a; motor forUac-tuating said contact member to mat-position, aswitchcontroly, ine; i dl. mot nd eli r mn irei m at, r asin aids ra ningwsand closing said motor controlling sw itel whereby, said; Contact member is. freed and said-motor moyes the same tornorm al posi im a a -a..alie qm ineanWate m n i s 0t, neans. preventing them simultaneoi isly takingnermal-position comprising means for, restraining one ,,of them in. abnormal, position, and ,means holding, said? restraining means restraining. osition when another ofsaid swi tches is in a bnormal position, said last namedmmans, responsive to movement oLsaid other ,ofsa-id switchestonormal po- 5 sition to .permit actuation of said ,i estrain ingmeans, andn ieans for thereaftenactuatr, ing said rest-raining means to free said one otisaid. siiitches. E i

, ,7 ,ljhe combination ith. electric switches, of ,m'eans preventing them simultaneously taking normal position comprising means for restraining (meet them in, abnormal posi.- tion, meansvholding said restraining means in restraining position when another of said switchcs is. in abnormal position, said last named smeans responsive to movement .of aid other of said switches tonormal positiontopermit actnation'of said restraining moansv a motive device for actuating said one of said switches to normal position, a switch controllingsaid,motive device, and means for actuating saidrestraining means i to tree said ,one of said switches and-for actuating said control switch to permit energization of said motive-derice.

The combination-with a movable con-, tactmember eta. switch, of a block for hold; ing the same inabnormal position, rmeans for actuatingvsaidblock to free'said .contact, 13,."

member, means for act'uatin said block in opposite direction when sai contactmemberfnioves to abnormal position, a second switch, and means responsive to the position a of a contact member of said second switch ber moves to abnormal position, a second switch, and "means gresponsive 'to the position of the movable contact member df'said second switch controlling' said spring. "I0. Thecombination 'withf'the movable cdntachmember's of electric switches, offia block for holding one ofsaidcontzict nieinzo bers in abnormal position, means foi actuating said block to allow movement of said contact mc'mber to normal p'ositionfland means responsive to the movement of an-' other"ol' said movablecontact members to abnormal-position, for exerting force on said blocktendingto move it to'position' to hold sai'd first'named contact-member in abnormal position."

11. The combination with the movable contact members of electric switches; one of said contact members taking its abnormal position when another t'akes'its' normal position; a blockfor holding one'of'said contact members in' abnormalpositiom'and means responsive toifnovement-off another or said contafiinmbers to" abnormal position -for exertingfor'ce upon said block, tending'to' move thesal'n'e to'position to hold said one contact member in abnormal'positionf f f 12. The combination with the movable cont-act members'of electric switches, one of said contact members takln its abnormal.

position when another takes its normal posi tion, a block for holding one'of said contact members in'abno'rmal position, means responsive'to movement of another ofsaid contact membersl'o abnormal posltion for exerting force uponf said block tending to 'move the same to position to hold said one contact member in abnormal position, and means for actuating said block to free said one contact member when said other contact member'is in normalposition. V

13. The combination with the movable contact members of electric switches and 'an actuating mechanism for each of said contact members, of a lost motion connection between said actuating mechanisms comprising means positively actuating one of them to abnormal position by movement'of another of said'actuatin'g mechanisms 'to normal position and upon reversed movementof said last named actuating mechanism producing no effect upon the other actuating mechanism, means for restraining in abnormal position the contact member actuated by said other of said actuating mechanisms, and means actuated by said one of said actuating'mechanisms controlling said restraining means. V' l 14. The combination withjmovable contact members of"switches"; of an actuating mechanism" for' each,-"an' operating member" positively connected. oneof saidactu atin'g mechanisms] an' operating member movable independentlyof 'anotherof' said actuating mechanisms, -a projection on said second operating member engaging said second actuating mechanism to move the associ ated contact 'memberto abnormal position, and a lost mot on 'connec-tionbetween sa1d operating members comprising means for actuating" said second 'operating member-to move its contactmeinber to abnormal posi tion when'said first operating-member moves its contact membertonormal position and having no efiect upon said second operating member when the 'co'i'it act member associated with said. first o' 'ieraaeg 'nielnb'e'r moves to abnormal position?" A 15. The combination' 'with -thc"mo\-'ablc contact memberjof an electric switch, of means for restraining the same' in 1 normal position, an independently movable operating member; projections thereon 'actu at-f" ingsaid restrainingineans and said contact member upon movement ofsaid operating member in one direction; 'a' second movable contact members of electric switches and an actuating mechanism for. each of said contact members; of a lost 'inoti'on connection between said actuating, mechanisms comprising means positivelyi'actuating one'o'f them to abnormal position by movement of another of said actuating mechanisms to normal position; and upon reversed movement of said last named actuating mechanism pro-' ducing no effect upon the other actuating mechanism, and means for preventin'g'movement ofisaid contact members to normal position simultaneously.

17. The combination with movable contact members of switches, of an actuating mechanism for each,' an operating member positively connected with one of'said actuating mechanisms, an operating member movable independently of another of said actuating 1nechanisms,;a projection of said second operating member engaging said second actuating mechanism to move the associeach. of. said. locking means,v-and means connecting said actuating means with each other.

'24. The combination with the "movable contact members 'otjelectric switches, of re: stra n ng. means tor each of said contact members, mcans'for actuatlngeach of. said restrain ng means,- means interconnecting said actuating means, motive means for ac? tuating said contact membersuto normal positionfsaid motive means tripping one of said contact members and actuating ittoabnormal position when'mori'ng another of,

said contact members to normab position,

electro-responsivemeans controlling said aci tuatingmeans, switches connected in parallel with'each other controlling said e1ectro-responsive means, one of saidswitches being open when one of said contactlmem said switches being closed whenanotherroff. sa d contact membersis in normal EOS1tlOI1,

anclfa'n operators "sw tch control sition,.dis engageablemechanical connections; vbetween said motorl' and said contact mem-'; bers, ineans. preventing vsimultaneous actugb,

" tion of said mechanical;connectionsby said,

hers, is m abnormal position and another of circuit through sairl switches.

,25.';The combination with the movable contact members of'electric' switches, .ofa.

motor for actuating the. sa'meto normalpo;

motor, meansfor. actliating one of said conz mt members beingactuated by. said" motor to abnormalpositionupon actuation of ane contact membersrof electricswitchesyof-a sition disengageable mechanical connections j 7 between said motor and said contact, members, meansprevent ng slmultaneons actu aother of said Contact members by said-motor to normal position, a :magnet winding. con,- trolling eachof said disengageable mechanical connections, a switch. in; the circ iit of; one of saidlmagnet windings, means controlt lin saidsn'itch topreVent energization of saig .magnet winding when said first named '7 contact member is in abnormal. position, and f an operatoris switchecontrollingsaid mag.

net winding circuit 7 26. The combination moyable motor for actuating thesameto normal po- "tion of said mechanical connections by said motor, a magnet windingcontrolling each of; said disengageable mechanical connections, aj switch inthe circuit of one of said: m'agnet windings, Ineanscontrolling said switch tog preventenergization of said mag:

net windingiwhenflsaid first namedcontact member 1 s ]ll abnormal pos1 t1 on,and anvoperators switch controlling said; magnet;

winding circnit, I 1 a a 27. The combination with'th'e movablecon tactmembers f electricswitches, of a motor fonfactuating the same to'flnormal position, disengageable mechanlcal connections bet kffien said motor and said contactmembers,

in the circuit of one of said magnet windings,

winding c rcuit; ,1

ng l the means preventing simultaneousactuation of said mechanical I'COHIIGCUOIIS by said motor, a magnet wlndi controlling each of said CllS- engageable mec anlcal'connections, a switch 1 means controlling said switch to prevent i energization' of said magnet winding when [said firstnamedj contactmember 1s m abnormal 'position,-and an operators switch controlling said motor and said magnet 75,

H 28. Thecombinationwith themov'ablecontact members of: electric switches,of a motor for actuating thej'same to normalposition, disengageable mechanical connections betweensaiclmotor and said contact'members, means preventing simultaneous actuation'of 7 said mechanical connections by said: motor,v means forgactuating; one of-said contact members by said motor to abnormal position upon actuation of another of said contact members by said motor to normal position,

a magnet winding controlling each of said "disengageable mechanical connections, 1' a 1 switch in" the circuit of that magnet winding,

controlling; the disengageable; ;mechanical connection for said other contact member,- means controllingsa dswitch to prevent en ergization of ;Sa1d "magnet wind ng --whenisaid one contact member iszin abnormalpo-;

sition, and aniaoperators switch controll ng; 1 said'magnetwinding circuit.

29; The combinat on with amovable con tact member of a circuit breaker',*of means for locking the. same in normal positiom'mo electro-magnetic means for actuating said locking means to free said contact member,

mean's' for blocking said contact member, in abnormal position; electro-magnetlc means for actuating said blocking means, and a m movable contact member 1 of a switch con trolling'said'bloclringmeans, 30. ,The "combination with a movable contactmember of a circuit breaker, of means for V lockingwthe same innormal position, electro-magnetic means, fo'ractuating .said locking me'ansto free said contact member, means ,for blocking said contact member in abnormal positiom: electrof-magnetic means for actuating said blocking means' a' mov- 1115 ablecontact member of a switch controlling saidtblocking means and means-for locking said last named contact member controlled by said first named electro-magnetictmeansi 31.;The combinationwith the movable con-g tact members of electric switches; ofamotorw for actuating the same tonormal position, disenga'geable mechanical connections vbev tween said motor and said contact members means preventing simultaneous actuation of said mechamicail. connections by said motor, j

a magnetwinding controlling one of-saidl disengageablez; mechanical connections, a

. switch controllingithe'circuitof said maga net Wmdmg, means for blockmg one of said-13o 1ec ro sisw c and; MW

ing v bf'si switches; of independent locking means for hpfpr lockihg-thfsamefjn normal ppsitio means'11 7319011 sivef to rr iovemenl; of .10 Said: switches to nqrmal position blockio l a d; Sw t he in abn fo n lb inati on w ith' um 1 of r independent" loc means 15 naps rgsponsive to' In 7 In ent or one switches to normal ,POSIILIOII, blbcking' H ember said mom;- uc tn I contact members td abnor a1-pbsition when; it actuates another of contact members tononnajl position. 1 H

35; "The; combination?" with a, plurality of lh e ntof;

nialis' fbiclosingusfdff 'o'n, I ting vs a'id bloc'kin ,m'e'a '(1 had Said positiom; 42.1 The 'c'ombl natlon h a p witches; f mans' prevent eoqslytakip er'slwhen movmg lts-swit tiori; to positively {opera member of another" switcha it move the same to meanslcfor blocking-one' of said switches in abnormalepositiomw I I I a 43. The combination: with :a plurality of I switches, of means preventing them simultaneously taking normal position com rising an foperating member for each swltch,

' aconnection between said operating mem -bers operated by one ofsaid operating mem- Iberswhenmoving its switch to normalposition 'to positively operate the operating memberoi another switch to positively move the same toabnormal; position", means for i blocking oneofsaid switches in abnormal position, and elect ro-responsive means controll ng sald blocklng means. a

The vcombination with a pluralitvlof switches, of means preventing thcm ;simlil taneously takingv normal position compris-- f ing an operating member for each switch,a

connection between said operating members operated by one of said operating members when moving its swltch to. normal position .toj .positively operate the opera-tingimembet: of another, switch to jpositivelc move the-samef to abnormal pos1t1on,1an means 1 controlled. byymovement of one of said switches to norma-Lposition forblocking' an! other of said switches in abnormal posltionr 4:5."The combination with a: plurality of switches, of meanspreventing them simultaneously ztaking normal position compris- V ing an operating member for, jeach switch,

a; connection betweensaid operating members operated by one of said operating members iwhen moving its switch ,to-normal p0- Sitioncto positively ,operate the operating member ofanother switch to positively move the same to abnormal positlonymeans controlled by movement of one of said, switches to normal position for blocking another of said switches inabnormal posit'1on,-andelectaro-responsive means controlling said block ing means.

.1 46. The combination iw i t h the mane position; e

ammo

contact members of electric switches,-of a i motor for sactuating the same, "means preventing simultaneous actuation of said a contact members to normal pos tion by Stud mocontrollingsaid motor, and electro-respohsive means for; releasing said blockinglmeans and for elosing said' motor control switch, whereby saidoneof said contact members 'i's' Efreed' andrs'aid motor actaates theisame to normalrpositiom-Q;

47. The combination itrolled by one-of said; contactmembcrs for x-blgockin-g anotheroffsaid contact membersin abnormal osition, a switch. controlling said said' motor control switch, whereby said one of said. contact members is freed and move y Said motor to rmal position. a

' 1 48.,Tlie' combination with ,the',.,movabletor, means for blocking one of saidcontact H members in abnormal position, a swltch for v with thelmovable contactmembers 'of electric: switches,- of u a. motor for actuatmg the same, means con-' lmotor', electro-responsive-meansfor res leaslng sa1d'fblock1ngLmeans andfor closing"- v contact' members ofuelectricrswitches; of a 1 motor for actuating fithe isame,--rmeans preventing'said motor simultaneously actuat- V ingsaid contact members to'normal position, meansIcontrolled by one of said contact members forblocking another of saicl contact membersin abnormalposition, aswitchcontrolling said motor, and electro-respon slve means for releasing saldblocking means and for closing sa1dmotorconti'0l switch,

whereby said one-ofsaid contactfmembers is freecland moved by saidmotor w normal n-QIn testimonywhereof I have hereunto atfixed my signaturein the presence of vthe 4 v WILL Witnesses Nutm- FIELD, Y

Amen S. MARSILL i fiancee! this patentmsy obtained to -nv'eecents each, by the 'coinmlsd oner ot, rates, 

